package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.SkuHasStockVo;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
@RabbitListener(queues = {"stock.release.stock.queue"})
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService wareOrderTaskService;
    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    OrderFeignService orderFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId
         * wareId
         */
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId) && !"0".equalsIgnoreCase(skuId)) {
            wrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId) && !"0".equalsIgnoreCase(wareId)) {
            wrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 查询有么有这个库存信息
        List<WareSkuEntity> entities = this.baseMapper.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            // TODO 远程查询sku 的名字,如果失败，整个事务无需回归
            // 1. 自己catch 异常
            // TODO 还可以用什么办法让异常出现以后不回滚
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }

            this.baseMapper.insert(wareSkuEntity);
        } else {
            this.baseMapper.addStock(skuId, wareId, skuNum);

        }
    }

    /**
     * 查询sku是否有库存
     *
     * @param skuIds 要查询的skuId集合
     * @return
     */
    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {

            SkuHasStockVo vo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * <p>
     * rollbackFor = NoStockException.class 默认只要是运行时异常都会回滚
     *
     * @param vo 库存解锁的场景
     *           <p>
     *           1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁
     *           2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁。
     *           *
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 目的：追溯库存信息（仓库、锁定的库存）
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(wareOrderTaskEntity);

        // 1、按照下单的收货地址，找到一个就近仓库，锁定库存。
        // 1、找到每个商品在那个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream()
                .map(item -> {
                    SkuWareHasStock skuWareHasStock = new SkuWareHasStock();
                    skuWareHasStock.setSkuId(item.getSkuId());
                    skuWareHasStock.setNum(item.getCount());
                    // 查询这个商品在哪里有库存
                    List<Long> wareIds = baseMapper.listWareIdHasStock(item.getSkuId());
                    skuWareHasStock.setWareId(wareIds);

                    return skuWareHasStock;
                }).collect(Collectors.toList());
        Boolean allLock = true;
        // 2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            // 1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            // 2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            for (Long wareId : wareIds) {
                // 成功就返回1 否则就是0
                Long count = baseMapper.lockStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    // TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity wareOrderTaskDetailEntity = new WareOrderTaskDetailEntity(null, hasStock.getSkuId(), "", hasStock.getNum(), wareOrderTaskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(wareOrderTaskDetailEntity);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(wareOrderTaskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(wareOrderTaskDetailEntity, stockDetailTo);
                    // 只发送id不行，防止回滚以后找不到数据
                    stockLockedTo.setDetailTo(stockDetailTo);
                    // 发送消息
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);

                    break;
                }
                // 当前仓库锁失败，重试下一个仓库

            }
            if (skuStocked == false) {
                // 当前商品所有仓库都没锁住
                throw new NoStockException(skuId);
            }
        }
        // 3、能到这里说明都没出现问题
        return allLock;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();
        /*

            解锁
            1、查询数据库关于这个订单的锁定库存信息。
                有，证明库存锁定成功了。
                    解锁：订单情况。
                        1、没有这个订单，必须解锁。
                        2、有这个订单
                            订单状态：已取消：解锁库存
                                    没取消：不能解锁库存。

                没有，库存锁定失败了，库存回滚了。这种情况无需解锁
         */
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId(); // 库存工作单的id;
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); // 根据orderSn查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    // 订单不存在或者订单已经被取消了，应该解锁库存
                    if (byId.getLockStatus() == 1) {
                        // 如果当前工作单详情，转态1 已锁定但是为解锁，为减扣才可以解锁
                        unlockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }

                }
            } else {
                // 由于feign的原因。消息拒绝重新放到队列里面，让别人继续消费。
                throw new RuntimeException("远程服务失败");
            }
        } else {
            // 无需解锁
        }

    }

    /**
     * 防止订单服务卡顿，导致订单消息一直改不了，库存消息优先到期，查订单转态为新建转态，什么都不做就走了。
     * 导致卡顿的订单，永远不能释放库存。
     *
     * @param to
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        // 查一下最新的库存的转态，防止重复解锁库存
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        // 按照工作单找到所有没有解锁的库存（工作单详情）进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id).eq("lock_status", 1));
        if (list != null && list.size() > 0) {
            // 解锁
            for (WareOrderTaskDetailEntity detail : list) {
                unlockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detail.getId());
            }
        }

    }

    private void unlockStock(Long skuId, Long wareId, Integer num, Long detailId) {
        // 库存解锁
        baseMapper.unlockStock(skuId, wareId, num);
        // 更新库存工作单的转态
        WareOrderTaskDetailEntity wareOrderTaskDetailEntity = new WareOrderTaskDetailEntity();
        wareOrderTaskDetailEntity.setId(detailId);
        wareOrderTaskDetailEntity.setLockStatus(2); // 已解锁
        wareOrderTaskDetailService.updateById(wareOrderTaskDetailEntity);

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}